docs: Update README and other documentation for new name

[thanethomson]

We need to update the README to remove all Tendermint-related references. Some aspects of the README won't work until we make this repo public, so we may need some follow-up work here then.

[andynog]

Just for clarification, when you say Tendermint-related references you're not just talking about renaming the word Tendermint but also any references to documentation for example ?

That's an interesting point, what is the proposed solution for links from the repo to documentation ? Assuming the current documentation will still be the Tendermint one (not sure we have an issue already for renaming/updating docs).

[jmalicevic]

That's a good point. There is an issue on chagning the README, but we should add one for documentation.

[thanethomson]

Just for clarification, when you say Tendermint-related references you're not just talking about renaming the word Tendermint but also any references to documentation for example ?

Yes, exactly.

This repo's docs are far more lightweight than CometBFT's, so I thought we could capture it all in a single issue/PR combo.